You might use Dig into a cloud. :3
Along with Pokemon, some moves and items are banned due to their ability to knock the Pokemon out of the sky. The following moves and items are banned for this reason: Iron Ball Gravity Smack Down Skill Swap Entrainment Gastro Acid Simple Beam Worry Seed
If you try to use dig then it says That move won't work well during a Sky Battle so hope I helped
Source Serebii